Office chair



FIG. 1.1 is a front perspective view of an office chair;

FIG. 1.2 is a rear perspective view;

FIG. 1.3 is a right view thereof;

FIG. 1.4 is a left view thereof;

FIG. 1.5 is a front view thereof;

FIG. 1.6 is a rear view thereof; and

FIG. 1.7 is a top view thereof.

The broken lines illustrate portions of the office chair and form no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 